Fix inject runtime env (#9421)

Script is using here-string <<< which is not supported by sh, using bash
instead
Also removing "sh" from the command to actually use the bash from the
shebang

packages/twenty-front/scripts/inject-runtime-env.sh

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/bin/bash
 
 echo "Injecting runtime environment variables into index.html..."